Finally driving again!, Type IV CIS conversion Options

[dlee6204]

I finally got to drive my 914 again! (IMG:style_emoticons/default/mueba.gif) (IMG:style_emoticons/default/biggrin.gif) Back in June I was having fits with the L-Jet system that was on my car so I decided it was time to tackle a project I was wanting to do for some time, a CIS conversion.

I retrofitted a CIS Basic system to my stock 1.8L engine using parts from various VWs and Mercedes and today I fired it up for the first time and was able to take it for a long drive. It felt AWESOME. Smooth reliable power all the way to redline. It has a nice growl to it too. (IMG:style_emoticons/default/evilgrin.gif) I'm quite impressed. I still have to make some small adjustments but at least now I can get back to driving the car daily and the best part, NO MORE JACKSTANDS! I'm going to drive the snot out of the car this week to get the system dialed in and hopefully next weekend I will take it for a day drive in the mountains. (IMG:style_emoticons/default/driving.gif) More details and pics to come later.


The cat is happy too!

[jcd914]

I can't speak to the overlap limits with CIS (K-jet) but I spent a number of years working 5 days a week on cars with CIS FI.
The system as a whole was relatively trouble free. The common issues were typical of most FI problems, vacuum leaks, injectors wear or get dirty, fuel pumps fail, fuel pump relays fail and of course vacuum leaks.
Also there seemed to be a number of techs that would "adjust" the pressures to improve something (drivability, performance, mileage, etc...), this was usually a huge disaster that cost a lot to fix. Fuel pressures are used throughout the system to control everything and they all have to work together.
Fuel contamination (water/rust or dirt in the fuel) could be a huge problem and required replacement of most components that had fuel going thru them. We had quite a few cases of fuel contamination in the late 70's early 80's but after gas stations started paying some big repair bills there seemed to be a big drop in contamination cases.

It was just a few years ago I sold my last Audi quattro with CIS and it worked fine with an unknown number of miles. It had 190K miles when I bought it and the speedo cable was broke, after I fix the speedo cable I found the odometer only counted miles sometime. I drove it 7 years after that and only replaced a fuel pump relay and an ignition module, well those were the only parts related the engine running at least.

Used parts seem to be available but watch out for dirty parts.

Jim

[Prospectfarms]

Thanks Jim, I value your "narrative of experience." I take that the major cans/components are not normally serviceable and the typical cause of failure is contamination of some sort.

I can't speak to the overlap limits with CIS (K-jet) but I spent a number of years working 5 days a week on cars with CIS FI.
The system as a whole was relatively trouble free. The common issues were typical of most FI problems, vacuum leaks, injectors wear or get dirty, fuel pumps fail, fuel pump relays fail and of course vacuum leaks.
Also there seemed to be a number of techs that would "adjust" the pressures to improve something (drivability, performance, mileage, etc...), this was usually a huge disaster that cost a lot to fix. Fuel pressures are used throughout the system to control everything and they all have to work together.
Fuel contamination (water/rust or dirt in the fuel) could be a huge problem and required replacement of most components that had fuel going thru them. We had quite a few cases of fuel contamination in the late 70's early 80's but after gas stations started paying some big repair bills there seemed to be a big drop in contamination cases.

It was just a few years ago I sold my last Audi quattro with CIS and it worked fine with an unknown number of miles. It had 190K miles when I bought it and the speedo cable was broke, after I fix the speedo cable I found the odometer only counted miles sometime. I drove it 7 years after that and only replaced a fuel pump relay and an ignition module, well those were the only parts related the engine running at least.

Used parts seem to be available but watch out for dirty parts.

Jim